package com.ljd.server.config.security;

import org.springframework.security.access.AccessDecisionManager;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.authentication.AnonymousAuthenticationToken;
import org.springframework.security.authentication.InsufficientAuthenticationException;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.stereotype.Component;

import java.util.Collection;

/**
 * 判断用户角色
 *
 * @author ljd on 2022/1/24
 * @PACKAGE_NAME: com.ljd.server.config.security
 * @PROJECT_NAME: yeb
 */
@Component
public class CustomUrlDecisionManager implements AccessDecisionManager {
    @Override
    public void decide(Authentication authentication, Object o, Collection<ConfigAttribute> collection) throws AccessDeniedException, InsufficientAuthenticationException {
        for (ConfigAttribute configAttribute: collection) {
            // 当前url所需的角色
            String needRole = configAttribute.getAttribute();
            // 判断角色是否登录即可访问角色,此角色在CustomFilter中设置
            if ("ROLE_LOGIN".equals(needRole)) {
                // 判断是否登录,如果authentication的父类是AnonymousAuthenticationToken,就说明没有登录
                if(authentication instanceof AnonymousAuthenticationToken) {
                    throw new AccessDeniedException("尚未登录,请登录");
                }else {
                    return;
                }
            }

            // 判断用户角色是否是url所需要的角色
            Collection<? extends GrantedAuthority> authorities = authentication.getAuthorities();
            for (GrantedAuthority authority:authorities) {
                if(authority.getAuthority().equals(needRole)) {
                    return;
                }
            }
        }

        throw new AccessDeniedException("权限不足,请联系管理员");
    }

    @Override
    public boolean supports(ConfigAttribute configAttribute) {
        return false;
    }

    @Override
    public boolean supports(Class<?> aClass) {
        return false;
    }
}
